野球バットの重心位置が打撃中のバットの動きに及ぼす影響

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  • ヤキュウ バット ノ ジュウシン イチ ガ ダゲキ チュウ ノ バット ノ ウゴキ ニ オヨボス エイキョウ
  • Effect of position of the center of gravity of a baseball bat on the motion of the bat during hitting

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Much remains unclear regarding the relationship between the position of the center of gravity of a baseball bat and the outcome of the hit. This study therefore aimed to clarify how a change in the center of gravity in a baseball bat affects the batter's hitting of a ball approaching from the front. The participants were four male members of a university baseball club (height: 171.3 ± 1.0 cm, weight: 68.3 ± 4.7 kg, baseball career: 11.3 ± 2.1 years) who hit a ball launched from a pitching machine located ahead of them. Participants attempted 10 swings using an experimental baseball bat with a modular center of gravity (adjustable from 0.482 m, 0.494 m, 0.507 m, 0.520 m, and 0.533 m from the end of the grip) . Changing the position of the center of gravity, in other words moment of inertia, affected the angular, rather than the linear motion of the swing. Furthermore, the angular momentum of the bat at impact depended on the position of the center of gravity. The swing was changed by the position of the center of gravity, in other words moment of inertia, of the baseball bat. Results indicate that the position of the impact approached closer to the head as the position of the center of gravity also became closer to the head. This shows that the position of the center of gravity of the bat affects the impact position of the bat and the ball upon a hit.

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